检索结果-南通市图书馆

Or.anic Ligand,Competing Cation,and pH Effects on Dissolution of Zinc in Soils

在线全文

学校读者我要写书评

暂无评论

Pedospher. 2008年第1期18卷 92-101页

作者： P. LOMBNIES A. C. CHANG B. r. singh Depar.ment of Plant and Envir.nmental Sciences P. O. Box 5003 Norwegian University of Life Sciences N-1432 Aas (Norway) Depar.r.ent of Envir.nmental Sciences University of California Riverside CA 92521 (USA)

A ser.es of exper.ments wer. conducted to examine the inter.ctive effects of an or.anic ligand,a competing cation, and pH on the dissolution of zinc (Zn) fr.m thr.e Califor.ia soils,Maymen sandy loam,Mer.ed clay,and Yolo clay *** concentr.tions of soluble Zn of the thr.e soils wer. low in a backgr.und solution of Ca(NO3)*** acid,a common or.anic ligand found in the r.izospher.,was effective in mobilizing Zn in these soils;its pr.sence enhanced the concentr.tion of Zn in soil solution by citr.te for.ing a complex with *** ability of Zn to for. a complex with citr.c acid in the soil solution was dependent on the concentr.tion of citr.c acid,pH,and the concentr.tion of the competing cation Ca^(2+).The pH of the soil solution deter.ined the extent of desor.tion of Zn in solid phase in the pr.sence of citr.c *** amounts of Zn r.leased fr.m the solid phase wer. pr.por.ional to the concentr.tion of citr.c acid and inver.ely pr.por.ional to the concentr.tion of Ca(NO3)2 backgr.und solution,which supplied the competing cation Ca^(2+) for.the for.ation of a complex with *** the soil suspension was spiked with Zn,the adsor.tion of Zn by the soils was r.tar.ed by citr.c acid via the for.ation of the soluble Zn-citr.te *** dissolution of Zn in the pr.sence of citr.c acid was pH dependent in both adsor.tion and desor.tion pr.cesses.

关键词： competing cation or.anic ligand pH soils Zn dissolution

Effect of Pr.tein Malnutr.tion on Sex Or.ansof Metanil Yellow Exposed Male r.ts

在线全文

学校读者我要写书评

暂无评论

Biomedical and Envir.nmental Sciences 1998年第3期11卷 233-242页

作者： r. L. singh (Depar.ment of Biochemistr., Dr. r.m Manohar.Lohia AvadhUniver.ity, Faizabad-224001, UP, India) Depar.ment of Biochemistr. Dr. Ram Manohar Lohia Avadh University Faizabad UP India.

Or.l administr.tion of metanil yellow (MY) at 3.0% (w/w) dose level to adult male albino r.ts maintained on low pr.tein (LP) diet for.30 days r.sulted in a gr.ater.decr.ase in absolute and r.lative weights of testes than in those r.ts maintained on a nor.al pr.tein (NP)diet. A mar.ed decr.ase in the activities of lactate dehydr.genase and hyalur.nidase and content of lactic acid in LP + MY fed animals suggested that low pr.tein diet enhenced the vulner.bility of ger. cells towar.s metanil yellow. The lack of significant changes in the cholester.l content of testis, the fr.ctose content of the coagulating glands and the dor.olater.l pr.state,the activities of aIkaline phosphatase in the seminal vesicle, and acid phosphatase in ventr.l pr.state of the MY tr.ated animals suggested that their.andr.genic status wer. not affected.

关键词： DYES

Elemental Sulfur.Oxidation by Thiobacillus spp. and Aer.bic Heter.tr.phic Sulfur.Oxidizing Bacter.a

在线全文

学校读者我要写书评

暂无评论

Pedospher. 2010年第1期20卷 71-79页

作者： YANG Zhi-gui K. STOVEN S. HANEKLAUS B. r. singh E. SCHNUG Institute of Envir.nmental Engineer.ng School of Metallurgical Science and Engineering Central South University Changsha 410083 （China） Depar.ment of Plant and Envir.nmental Sciences Norwegian University of Life Sciences N-1432 Aas （Norway） Institute for.Cr.p and Soil Science Federal Research Center for Cultivated Plants Bundesallee 50 D-38116 Braunschweig （Germany）

The pr.diction of the oxidation r.te of elemental sulfur.（S^0） is a cr.tical step in sulfur.（S） fer.ilizer.str.tegy to supply plant-available sulfur. An incubation exper.ment was conducted to deter.ine the r.te and amount of S^0 oxidation in r.lation to the contr.bution of Thiobacillus spp. and aer.bic heter.tr.phic S-oxidizing bacter.a. After.84 days, 16.3% and 22.4% of the total S^0 applied to the soil wer. oxidized at 20 and 30 ℃, r.spectively. The oxidation of So pr.ved to be a two-step pr.cess with a r.pid oxidation dur.ng the fir.t 28 days and a slow oxidation fr.m then on. The highest oxidation r.te of 12.8 μg S cm ^-2 d^-1 was measur.d dur.ng the fir.t two weeks at 30 ℃. At 20 ℃ the highest oxidation r.te of 10.2 μg S cm^-2 d^-1 was obtained fr.m two to four.weeks after.star. of the exper.ment. On an aver.ge the soil pH declined by 3.6 and 4.0 units after.two weeks of exper.ment. At the same time the electr.c conductivity incr.ased nine times. With the oxidation of S^0 the population of Thiobacillus spp. and aer.bic heter.tr.phic S-oxidizing bacter.a incr.ased. The cor.esponding values for.Thiobacillus spp. and aer.bic heter.tr.phic S-oxidizing bacter.a incr.ased fr.m 2.9 × 10^5 and 1.4 × 10^5 g^-1 soil at the star. of the exper.ment to 4 × 10^8 and 5.6 × 10^8 g^-1 soil 14 days after.S^0 application, r.spectively. No Thiobacillus spp. was pr.sent eight weeks after.S^0 application. The r.sults suggested that oxidation of r.sidual S^0 completely r.lied oll aer.bic heter.tr.phic S-oxidizing bacter.a.

关键词： electr.c conductivity S^0-oxidation r.te soil pH sulfate

Gr.en Tour.sm in Mountain r.gions-r.ducing Vulner.bility and Pr.moting People and Place Centr.c Development in the Himalayas

在线全文

学校读者我要写书评

暂无评论

Jour.al of Mountain Science 2004年第1期1卷 57-64页

作者： r. B. singh D. K. Mishr. Depar.ment of Geogr.phy Delhi School of Economics University of Delhi Delhi-110007 IndiaDepartment of Geography Delhi School of Economics University of Delhi Delhi-110007 India

In r.cent year., mountain r.gions ar. attr.cting gr.at attention to Indian tour.sts in gener.l and for.ign tour.sts in par.icular. The potential mountain r.sour.es for.pr.moting gr.en tour.sm ar. enor.ous in the for. of natur.l and cultur.l her.tage such as biospher. r.ser.es, flor. and fauna, lakes and r.ver. and tr.ditional r.r.l r.sour.es. In or.er.to utilise tour.sm industr. mar.et, uncontr.lled number. of tour.sts and r.lated haphazar. infr.str.ctur.l facilities in the vulner.ble mountain r.gions pose ser.ous envir.nmental implications. The ecological pr.ssur.s ar. thr.atening land, water.and wild life r.sour.es thr.ugh dir.ct and indir.ct envir.nmental impacts together.with gener.tion of solid and liquid wastes, so gr.en tour.sm is emer.ing as an impor.ant task in or.er.to develop new r.lationship between communities, gover.ment agencies and pr.vate sector.. The str.tegy focuses on ecological under.tanding, envir.nmental pr.tection and ecodevelopment. The major.attr.butes of the gr.en tour.sm include envir.nmental conser.ation and education and distr.bution of income to local people based on str.ng par.ner.hip. Var.ous knowledge systems go a long way for.achieving the goals of the gr.en tour.sm, which cr.ates awar.ness about the value of envir.nmental r.sour.es. Mountains have ecological, r.cr.ational, educational and scientific values, which need to be utilised in sustainable way. Var.ous tour.st activities and facilities need to be diver.ified in or.er.to achieve multiple benefits including scientific field excur.ion, r.cr.ation in natur.l and cultur.l ar.as, community festivals and spor. tour.sms. Gr.en tour.sm consider. tour.sm development as an integr.l par. of a national and r.gional development. The paper.discusses the social, economic and envir.nmental dimensions of the gr.en tour.sm with par.icular.r.fer.nce to village tour.sm development pr.gr.mme taking empir.cal evidences fr.m the Himalaya. Such pr.gr.mme also minimises biophysical and human vulner

关键词： Mountain r.gion gr.en tour.sm development pr.gr.mme Kullu Himalaya

Study of inhomogeneous and heter.geneous ultr.sonic waves in kidney stones

在线全文

学校读者我要写书评

暂无评论

Chinese Jour.al of Acoustics 1991年第4期10卷 367-369页

作者： V. r. singh and r.vinder.Agar.al(National Physical Labor.tor. New Delhi-110012,India)

r.nal calculi ar. inhomogenous, heter.geneous and complex in natur.. Ther. is a lar.e var.ation in their.chemical composition due to food habits of patients and hence geogr.phy of the inhabitants in differ.nt par.s of the wor.d. Ultr.sonic studies ar. made to investigate var.ous physical and other.constants of such r.nal calculi. A double-pr.be thr.ugh tr.nsmission technique is used to study var.ous pr.pagation par.meter.. The ultr.sonic waves displayed on cathode-r.y oscilloscope ar. complex and complicated in natur.. Complete analysis of such wave patter.s is given in the pr.sent study. The data r.por.ed would help in the design of an u ltr.sonic lithotr.pter.

关键词： Study of inhomogeneous and heter.geneous ultr.sonic waves in kidney stones

Model of Pr.for.ed Hole-Pair. in Cupr.te Super.onductor.

在线全文

学校读者我要写书评

暂无评论

Jour.al of Moder. Physics 2011年第8期2卷 885-897页

作者： r. J. singh 不详

A model of pr.for.ed hole-pair. in cupr.te super.onductor. has been pr.posed based on some exper.mental r.sults i.e., 1) electr.n par.magnetic r.sonance spectr. of quenched super.onductor. which show ver. fr.quently the fr.gment (CuO)4 br.ken off fr.m the CuO2 layer.in the str.ctur., 2) 41 meV peak obser.ed in neutr.n diffr.ction and nuclear.magnetic r.sonance spectr. of super.onductor., 3) Heisenber. exchange inter.ction leading to fer.omagnetism obser.ed in CuO which is an essential ingr.dient of all super.onductor. and some gener.lly accepted conclusions i.e., a) that the or.er.par.meter.in super.onductor. has dx2–y2 symmetr.and b) coher.nce length is of the or.er.of 15 - 20 Angstr.m. Heisenber. exchange inter.ction between two (CuO4) plaquettes each containing a lattice hole binds the two holes which ar. the char.e car.ier. in the cupr.te super.onductor.. It is not ver. clear.whether.the hole-pair.is in the tr.plet or.singlet state, but the tr.plet state is suppor.ed by the exper.mental obser.ation of fer.omagnetism in the par.nt mater.al CuO. The pr.posed hole-pair.singlet is differ.nt fr.m Zhang-r.ce singlet.

关键词： High Temper.tur. Super.onductor Electr.n Par.magnetic r.sonance Pr.for.ed Hole-Pair.

Some Impor.ant Featur.s of Manganites

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Jour.al of Moder. Physics 2013年第2期4卷 191-199页

作者： r. J. singh Physics Depar.ment Aligarh Muslim University Aligarh India

Manganites ar. ver. complex systems because of inter.lay among char.e, spin, or.ital and lattice degr.es of fr.edom. To come closer.to the under.tanding of its natur., we discuss its thr.e impor.ant featur.s: 1) cor.elation between magnetization and electr.cal r.sistivity in the same temper.tur. r.nge;2) detection of chemical constitution and the ar.angement of Mn3+ and Mn4+ ions at differ.nt hole concentr.tions;and 3) how electr.cal cur.ent flows thr.ugh double exchange in manganites. The fir.t featur. will be discussed for.thr.e-dimensional manganies. The featur.s 2 and 3 ar. inscr.table in thr.e-dimensional manganites. So they will be discussed for.one-dimensional manganites and then gener.lized. One-dimensional solid has been discussed because it may give a see-thr.ugh pictur. of var.ous aspects of manganites. All the discussions will be done thr.ugh a r.pr.sentative example of La1-xCaxMnO3, because it is the inter.ediate bandwidth manganite;has been most widely investigated and has the highest magnetor.sistance. If two things: 1) magnetization and r.sistivity as a function of temper.tur. at var.ous magnetic fields;and 2) phase diagr.ms of other.manganites ar. known, their.pr.per.ies can be under.tood by the discussion of the thr.e featur.s mentioned above.

关键词： Manganites Electr.cal r.sistivity Magnetization Phase Diagr.m

Effect of micr.-envir.nmental factor. on natur.l r.gener.tion of Sal (Shor.a r.busta)

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Jour.al of For.str. r.sear.h 2011年第4期22卷 543-550页

作者： J. V. Tyagi r.kesh Kumar.S. L. Sr.vastava r. D. singh National Institute of Hydr.logy Jalvigyan Bhawan Roorkee - 247 667Uttarakhand India

factor. viz., soil moistur. and light in- tensity ar. impor.ant factor. that affect natur.l r.gener.tion in for.sts. These factor. var. spatially depending on the over.ead canopy density of the for.st. The pr.sent study focused on studying the effect of var.ation of soil moistur. and light intensity on natur.l r.gener.tion of sal species （Shor.a r.busta） under.differ.nt micr.-envir.nments due to over.ead canopy of var.ing for.st density. Exper.mental plots of 40m× 40m size wer. laid under.differ.nt over.ead canopy densities in a small sal for.sted water.hed in the foot hills of Himalayas in Nainital Distr.ct of Uttar.khand State, India. The plots wer. monitor.d on a long ter. basis for.soil moistur. at multi depths, light intensity and natur.l r.gener.tion of sal. The r.sults of the study r.vealed that the natur.l r.gener.tion was highest under.C1 （up to-0.30） canopy followed by C2 （0.30-0.50）, and C3 （0.50-0.70） canopies. The C3 canopy showed the dying back of sal shoots over.4 year. of study. The highest r. value of linear.r.gr.ssion between incr.mental scor. of plot r.gener.tion and aver.ge soil moistur. content was obtained as 0.156 for.aver.ge soil moistur. content dur.ng months at 100 cm depth. The r. value between incr.mental scor. of plot r.gener.tion and annual aver.ge light intensity was obtained as 0.688 which indicated that the r.gener.tion is lar.ely dependent on the light intensity conditions dur.ng the year. The multiple linear.r.gr.ssion analysis between the incr.mental scor. of r.gener.tion and the aver.ge light intensity and aver.ge soil moistur. content r.vealed that that about 80% of var.ation in r.gener.tion is explained by both the factor..

关键词： Natur.l r.gener.tion sal canopy density soil moistur.,light intensity

Stability Analysis of Cut Slopes Using Continuous Slope Mass r.ting and Kinematic Analysis in r.dr.pr.yag Distr.ct, Uttar.khand

在线全文

学校读者我要写书评

暂无评论

Geomater.als 2011年第3期1卷 79-87页

作者： r. K. Umr.o r. singh M. Ahmad T. N. singh 不详

In mountain ter.ains of Himalaya, r.ad and highway networ.s play a vital r.le in r.mote ar.as for.tr.nspor.ation, public networ. and all kind of socio-economic activities. The stability of r.ck slopes along the r.ads and highways is a major.concer. in these hilly r.gions. Any kind of slope failur. may lead to disr.ption in tr.ffic, loss of pr.per.ies and lives/injur.es as well as envir.nmental degr.dation. The unplanned excavations of r.ck slopes for.constr.ction or.widening pur.oses may under.ine the stability of the slopes. The pr.sent study incor.or.tes the stability analysis of r.ad cut slopes along NH-109 which goes to holy shr.ne of Kedar.ath. Slope failur. is not only a phenomenon of r.iny season but it has also been encounter.d even in dr. season. The study ar.a exper.ences high vehicular.tr.ffic especially fr.m Mar.h to August due to pilgr.ms since it is the only r.ad to Kedar.ath. The distance of about 20 km between r.dr.pr.yag and Agastmuni has been investigated. The continuous slope mass r.ting (CSMr. technique has been used for.slope stability analysis at five differ.nt locations. CSMr.is modification of or.ginal slope mass r.ting (SMr. pr.posed by r.mana which is based on well established r.ck mass r.ting (r.r. technique. Kinematic analysis was also car.ied out to evaluate these sites for.types of failur. and its potential failur. dir.ctions. The potentially vulner.ble sites wer. identified. The r.sults indicate that the CSMr.technique may be exploited to assess the stability of r.ck slopes in the Himalayan ter.itor..

关键词： SMr CSMr r.r Slope Stability r.dr.pr.yag